Truck issue long time no start

After sitting 5 years, it wouldn't seem far fetched to me to change the oil twice. Might be a little rust built up in there. Oil in there has probably degraded. I would probbly goes as far as to pull all the air intake hoses off and check for signs of critters getting in there. It would not be a good thing to try to start it and suck a mouse nest or nut shells into the head.

 

Doing that will flush out everything in the motor. Not necessary in my opinion. After you drain the old oil just flush a gallon or 2 of new stuff through and call it good.

 

Change the oil after you get it running and warmed up. Put a can of motor flush in, drive it a hundred miles, then drain and fill.

 

When it truck sits for many years seals tend to go bad.

Especially wheel seals axle seals yoke seals transmission output seals, steering gear seals...

Hopefully not engine seals. Air pancake and brake chamber seals leak...

Check all hoses and belts and grease your throw out bearing.

Sitting is not good for a truck. I'm sure there's plenty more I'm not thinking of.

I wouldn't travel too far away from home until you have fix these things because you may find yourself stuck or you may blow out a seal for your rear and not realize it and next thing you know you have blown Rears or trans..

Air valves can also stick I like I said it's probably a bunch of other stuff I'm not thinking of...

Good luck